These are Round Solid Styrene Rod. FEATURES: Used for Bracing, Cabling, Piping, Wiring, or Conduit Precision Extruded in White Styrene Plastic Ideal for all Facets of Model Building INCLUDES: Five Round Styrene Rods SPECS: Actual Outer Diameter: 3/16" (4.8mm) Length: 10" (250mm) CJH 12/09/99 ir/jl